George f



(No Model.)

2 Sheets-Sheet 1. l

G. READ. DOUBLE UILINDEN PERI'BCTING PRINTING MACHINE.

I (No Model.) 2 Sheets-Sheet 2.

- @BREAD DOUBLE GYLINDBR-IBRIBGTING PRINTING MACHINE.

' Patented Nov. I9, 1895.

lll'. "lll AN DREW BGRAHAM. #MOTO-UMAQZWASNINGIUN. ILC.

GEORGE F. READ, OF BROOKLYN, ASSIGNOR TO ROBERT H. MEAD, AND CHARLES W. CARPENTER, OF NEV NITED STATES PATENT Af-D-TricE.

HOE, THEODORE YORK, N. Y.

DOUBLE-CYLINDER PERFECTING PRINTING-MACHINE.

.SPECIFICATION forming part of Letters Patent No. 549,934, dated November 19, 1895.

Application flied Aprii 17, 1895.

To a/ZZ whom t may concern:

Be it known that I, GEORGE F. READ, a citi- Zen of the United States, residing atA Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Double-Cylinder Perfecting Printing-Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to sheet-perfecting printing-machines in which two impressioncylinders continuously revolving in opposite directions co-operate with a reciprocating type-bed, each cylinder printing during its second revolution and so rising and falling with respect to the passing bed beneath that While one cylinder is down in printing relation to the bed its companion cylinder is up out of such printing relation. ln such printing-machines each sheet fed to the fingers of the iirst impression-cylinder and printed upon one side is transferred to the iingers of the second impression-cylinder and printed uponthe other side. At the time this transfer is being made the second cylinder is raised out of contact with the form, which is then traveling in the opposite direction, and when the cylinder is thus raised the distance between the centers of its meshing drivingwheels is so increased as to allow so much play between the teeth of these wheels that' there results an imperfect transfer of the sheet from cylinder to cylinder and an inaccurate register of the two printed sides.

The present improvement consists in providing the driving-wheels of the second impression-cylinder with segments the sum of whose pitch radii substantially equals the increased distance between the centers of said driving-wheels, the teeth of which segments, being thus caused to fit each other without play, insure an accurate transfer and register.

A practical embodiment of these improvements is illustrated in the accompanying drawings, wherein- Figure 1 is an elevation of so much of the gear side of a double-cylinder sheet-perfecting printing-machine as is necessary to show the invention. Fig. 2 is an end elevation of the same. Fig. 3 is a view similar to Fig. 1, but

as appears from their arrows,

Serial No. 546,008. (No model.)

having its parts in different positions from that shown in Fig. 1 and Fig. 4 is an enlarged view of the driving-wheels of the second impression-cylinder, parts of the rims being removed to show the registering seg. ments.

, The primary impression-cylinder P and the secondary impression-cylinder S are mounted in the usual manner in sliding journal-boxes guided in the side frames and provided with means for raising and lowering them, only the rods 9 l0 l1 l2 of which are indicated.

The impression-cylinders are revolved in the usual manner by means of driving-wheels 20 21 22 23, the wheel 20 meshing with the impression-cylinder wheel 21, the wheel 22 meshing with the impression-cylinder wheel 23, the wheels 2O 22 being intermeshed, the latter driven by a pinion 24 on the driving-shaft and being also intermeshed with the wheel 25 on the oscillating bed-driving shaft 26, all of which gearing is commonly applied as shown. The cylinders revolve in opposite directions,

and co-operate 75 with a type or form carrying bed B, which is reciprocated by well-known mechanism operated through the shaft 2li-as, for instance, such as is shown in Patent N o. 473,484.

The sheets are fed from a board or table T to the grippers 3 of the primary impressioncylinder P, by which they are carried around upon the surface of said cylinder and pressed into contact with the form carried bythe bed B while the latter is running in the direction of the arrow in Fig. 1, which figure illustrates that revolution of the primary cylinder when it is lowered into printing position, at which time, as is shown, the secondary cylinder S is raised out of printing position. pers 3 4 of these cylinders each other the'grippers 3 release the printed sheet and the grippers 4 seize the same, the cylinder P thereafter making its inoperative revolution, and the cylinder S carries the sheet, printed upon one surface, with it to be perfected or printed upon the oppositesurface by being carried into contact with the form on the bed B while the latter is moving in the direction of the arrow in Fig. 3, at which time the cylinder S is lowered into printing position.

As the gripapproach and pass IOC) Then the once-printed sheet is being transferred from the grippers 3 to the cylinder S to be clamped thereon by the grippers 4, it is essential for perfect work that the relation this cylinder S then has to the cylinder P shall be maintained in order that a true register of the matter printed upon the opposite surfaces of the sheet may be attained.

In order to prevent any play between the driving-wheels 22 23 of the cylinder S at the time when that cylinder is raised and the sheet is being transferred to it from the cylinders P, whence would result an imperfect transfer and inaccurate register, the said wheels 22 23 are provided with segments 5 (i for maintaining the exact required relation of these wheels 22 23 at the time when the cylinder S is raised and their teeth are separated a considerable distance. These segments 5 G are secured to the rims of the wheels 22 23 at such points thereof and are of such circumferential extent that while the cylinder S is raised and is making so much of that revolution in which its grippers are approaching the transfer-point and are receiving the once-printed sheet from are cylinder P said segments, whose pitchlines are of greater circumference than those of the wheels 22 23, are interni'eshed and,accuratel y fitting each other, operate to hold the drivin g-wheels in accurate corelation. and to prevent play between the separated teeth of the said drivin g-wheels, thus securing a perfeet transfer of the sheet to the cylinder' S as will bring its portion printed while carried by the cylinder S into accurate register with the portion previously printed, or while the sheet was carried by the cylinder P. Although these segments 5 G are required to be intermeshed only at each second revolution of the cylinder S and while that cylinder is raised, it is obvious, since they are enlarged with respect to the driving-wheels 22 23, that they must clear themselves on the alternate revolutions of this cylinder, as otherwise they would prevent its being lowered into printing position with respect to the bed 13. To accomplish this, the intermediate or driving wheel 22, which engages the cylinder or driving wheel 2.3, is made of such proportion to it that it makes three revolutions while the cylinder-wheel is making two. Hence the segment 5, carried by intermediate or driving wheel 22, which was in gear with the segment G, carried by the cylinder or driving wheel 23, on its rst revolution, or during the sheettransferring operation, as in Fig. l, will make one and one-half revolutions, and thus be opposite to it as the cylinder or driving wheel 23 makes its second revolution, as in Fig. El, and thus clear it.

NVhat is claimed is# l. In a double cylinder printing machine, the combination with the secondary impression cylinder, means for raisin g and lowering it, and its driving wheels, as 22, 2 3, of registering segments of greater pitch radii than said wheels, substantially as described.

2. In a double cylinder printing machine, the combination with the secondary impression cylinder, and means for raising and lowering the same, of a driving wheel on said cylinder and a driving wheel en ga-gin g therewith, each of which wheels carries a segment of greater pitch radius than the wheel, said wheels being of such relative size that said segments shall en gage each other on one revolution of said cylinder and clear each other on the second revolution of said cylinder, substantially as described.

In testimony whereof I have hereunto set my hand in the presence oi two subscribin witnesses.

GEORGE F. READ.

lVitnesses:

F. W. II. CRANE, E. L. SPEIR. 

